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Accountability Analysis of Electronic Commerce Protocols by Finite Automaton Model

Wuhan University Journal of Natural Sciences 2004年第3期9卷 293-295页

作者： Xie Xiao-yao 1,2 , Zhang Huan-guo 1 1. School of Computer, Wuhan University, Wuhan 430072, Hubei, China 2. Institute of Network Technology, Guizhou University of Technology, Guiyang 550003, Guizhou, China School of Computer Wuhan University Wuhan Hubei China Institute of Network Technology Guizhou University of Technology Guiyang Guizhou China

The accountability of electronic commerce protocols is an important aspect to insures security of electronic transaction. This paper proposes to use Finite Automaton (FA) model as a new kind of framework to analyze the transaction protocols in the application of electronic commerce. Key words finite automaton - electronic commerce - nonrepudiation - information security CLC number TP 393. 08 Foundation item: Supported by the National Natural Science Foundation of China (66973034, 90104005, 60373087)Biography: Xie Xiao-yao (1952-), male, Professor, Ph. D candidate, research direction: information security.

关键词： finite automaton electronic commerce nonrepudiation information security

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Convertible Proxy Signcryption Scheme

引用

Journal of Harbin Institute of Technology(New Series) 2004年第2期11卷 209-213页

作者：李继国李建中曹珍富张亦辰 School of Computer and Information Engineering Hohai University Nanjing 210098 China School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China Dept. of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200030 China School of Computer and Information Engineering Hohai University Nanjing 210098 Chinan 1996 Mambo et al introduced the concept of proxy signature. However proxy signature can only provide the delegated authenticity and cannot provide confidentiality. Recently Gamage et al and Chan and Wei proposed different proxy signcryption schemes respectively which extended the concept of proxy signature. However only the specified receiver can decrypt and verify the validity of proxy signcryption in their schemes. To protect the receiver's benefit in case of a later dispute Wu and Hsu proposed a convertible authenticated encryption scheme which can enable the receiver to convert signature into an ordinary one that can be verified by anyone. Based on Wu and Hsu' s scheme and improved Kim's scheme we propose a convertible proxy signcryption scheme. The security of the proposed scheme is based on the intractability of reversing the one-way hash function and solving the discrete logarithm problem. The proposed scheme can satisfy all properties of strong proxy signature and withstand the public key substitution attack and does not use secure channel. In addition the proposed scheme can be extended to convertible threshold proxy signcryption scheme.

In 1996, Mambo et al introduced the concept of proxy signature. However, proxy signature can only provide the delegated authenticity and cannot provide confidentiality. Recently, Gamage et al and Chan and Wei proposed different proxy signcryption schemes respectively, which extended the concept of proxy signature. However, only the specified receiver can decrypt and verify the validity of proxy signcryption in their schemes. To protect the receiver's benefit in case of a later dispute, Wu and Hsu proposed a convertible authenticated encryption scheme, which can enable the receiver to convert signature into an ordinary one that can be verified by anyone. Based on Wu and Hsu' s scheme and improved Kim's scheme, we propose a convertible proxy signcryption scheme. The security of the proposed scheme is based on the intractability of reversing the one-way hash function and solving the discrete logarithm problem. The proposed scheme can satisfy all properties of strong proxy signature and withstand the public key substitution attack and does not use secure channel. In addition, the proposed scheme can be extended to convertible threshold proxy signcryption scheme.

关键词： proxy signcryption nonrepudiation digital signature proxy signature

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